Corner-bead manufacture.



N. E. CLA

CORNER BEAD MA URE APPLICATION FILED 0 .1914

HEE [ET 1,142,494. aEG tGdJ ,1915,

WITNESSES INVENTOR Mrrisl'] pre ark,

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APPLICATION FILE .I2, 1914. I 1,142,494, Patented June 8, 1915.

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Specification otLetters Patent.

Patented June 8, 1915.

Application filed December 12, 191a. semi no; 876,773.

To all whom it may concern Be it-known that-I, Norms ELMORE CLARK,

a citizen=of the United States of America and residing atPlainville, in the county Hartford and State of Connecticut, have invented new and useful Improvements in Corner-Bead Manufacture, of which the following'is-a specification.

My invention relates not only to an 1mproved corner bead construction but to the method ofmanufacture and a. machine for carrying out this method automatically.

It is my main object to makea head which is relatively cheap but strong and which will afford a satisfactory key for the plaster.

The bead has plaster-receiving openings in each side; These openings are preferably formed by simply slitting the metal and turning the edges ofthe slits soas to constitute reinforcing flanges instead of by punching andremoving portions as has been customary. Preferably there are a plurality of rows of these openings in each side of the head with longitudinal ribs constituting reinforcing members between the rows. The

edges of the openings are preferably turned under so as to provide under-cut key-ways for securely anchoring the plaster. also prefer to stagger the openings on each-side so as to better distribute the keying efi'ect. The preferred construction has what is termed a bull nose or flanged edge. On account ofth'e disadvanta es of hot or electro galvanizing or sherar izin I may pro vide a pure zinc protecting e ge mechanically applied.

The construction above outlined particularly lends itself to manufacture by a continuous process in a single machine receiving the blank sheet or stripv at one end and delivering the finished product. The machine in, its simplest form consists of a. plurality of sets of rolls with connecting guides and gages when desired whereby a sheet may be cut into strips and each strip first slitted, the edges of the slits flanged to form openings and to reinforce the sides, the strip then gradually bent adjacent the center by raismg the center and depressing theedges,

bending or turning under the edges of the flanges of the openings, contracting the sides adjacent the center to start the edgg flange or the bull nose, continuing the drawing in of the sides and finishing the'bull nose and then straightening the beadif'necessary. The zinc protectingribbon may be attached by running it into the machine after the holes have been formed, then tucking portions of the edges of the ribbon into ingthe cutting of itinto two strips and the successive slitting and formation of the openings, and longitudinal ribs. Fig. 3, shows a side view and an end View of a fragment of the preferred form of the completed product with the openings staggered and the flanges turned inward. Fig. 4, shows a fragmentary side and an end view of a modification of the product with the openings on each side arranged side by side. Fig. 5, shows a fragmentary side view and an end of another modification of the product with the flanges turned outward. Fig. 6. is an end view of another modification of the product. Fig. 7, shows an end andside view of another modification of the product with only one rib and two rows of openingsin each side. Fig. 8, shows an end view and a side view of anothenmodification of the product. Fig. 9, is a fragmentary View of'the infeeding and edge smoothing rolls. Fig. 10, is a fragmentary sectional view of the slitting rolls and showing diagrammatically the product as affected there- Fig. 11, is a fragmentary sectional view of the corrugating and hole opening rolls and showing diagrammatically the product as affected thereby. Fig. 11 is a sectional view of the'zinc guide. ig. 12, is a fragmentary sectional view of the zinc tucking rolls and showing. diagrammatically the product as affected thereby. Fig. 13, is

pair of head forming rolls and showing diagrammatically the product as affected thereby. Fig. 1 5, is a fragmentary sectional view of the second pair of head formingrolls and showing diagrammatically the product as affected thereby. Fig. 16, is a fragmentary sectional view of the third pair of bead forming rolls and showin diagrammatically the product as aifecte thereby. Fig. 17, is a fragmentary sectional view of the first set of bull nose forming rolls and showing diagrammatically the product as affected thereby. Fig. 18, is a fragmentary sectional view of the second set of bull nose forming rolls and showing diagrammatically the product as afl'ected thereby. 1F ig. 19, is a fragmentary sectional view of the final set of bull nose forming rolls and showing diagrammatically the product as afiected thereby.

The product consists of the bead'proper, corner member or front edge 1 and two sides which flare outwardly therefrom. The rear edges 2 of the sides in the form shown are continuous. Three rows of openings 3, 3, 3" are provided in each side. The rear edge 4 of each opening 3. of the outer row is flanged inward and under so as to adord a key-way for the plaster and to reinforce the .side. Similarly the front edge-1' of each of the openings 3' in the rear row is bent inward and turned under. Similarly both edges 4" of each opening of the central row are bent inward and turned under. The flanges 4, at and 4" are turned inward in such a way as to provide ribs 5, 5 extending longitudinally of the sides between the rows of openings. These ribs reinforce the sides materially and make it possible to use a much lighter gage of metal than would otherwise be desirable. As the openings are formed by displacing the metal in such a way as to reinforce the sides, the head for a given gage of metal is much stronger than where the metal. is removed as is the customary practice. I In the preferred form the bead proper is provided with lateral flanges or shoulders 6, 6, of the bull nose type which is found more desirable in a construction of this character. The rear edges are preferably provided with holes such as 7 for attaching nails or wires. The exposed edge or the nose of the bead may be protected by means of a strip or ribbon 8 of suitable material such a. pure zinc.

A plurality of beads may be formed simultaneously by trains of rolls appropriately arranged but it will be necessary to describe only the formation and operation on a single strip. The stock 10 may be of a width to form one or more beads. In the present instance in Fig. 2, the stock is of the Width of two beads and is divided along the line 11 into two strips. The stock of each strip is slitted along each side of its center line as at 12, 12 and 12" in staggered arrangement, and the slits on opposite sides of the center line being relatively staggered. The edges 13, 13 and 13 of these slits are flanged or bent down substantially at right angles to the plane of the strip. At the same time the metal at 14:, l t and 1a is inclined in the same general direction so as to facilitate the fianging action and complete the formation of the ribs 5, 5. Afterward the flanges 13, 13', 13 are bent under as at 4%, d and 4." respectively to improve the keying efit'ect in the plaster.

Close to and on each side of the center line the strip is slightly corrugated, grooved or bent along the lines 15 which ultimately form the shoulders or side edges 6, 6.

The rolls 16 feed the stock into the ma- 1.

chine and the grooved rolls or disks 17 guide it and smooth the stock at the edges. The disks 18 and 18 acting in conjunction with the disks 19, 19' and 20, 20 serve to form the slits 12, 12 on opposite sides of the center line of the strip as the stock passes through.

The slits 12 are formed by the cooperation of the disks 21, 21' and 22, 22. The slits 12 are formed by the cooperation of the disks 19, 19 and 22, 22. It will be noted in Fig. 10 that in forming the outer row of slits the edges are somewhat depressed from the plane of the metal between the slits 12,

and 12" and similarly the metal between the rows of slits l2 and 12" is somewhat depressed. This action facilitates the cutting as well as the subsequent ribbing.

projections 26, 26 which cooperate with the M projections 25, 25 and 25" in forming the ribs, the upper roll being cut away to correspond therewith making due allowance for the thickness of the metal at the ribs. The upper roll is provided with projections 2 for assisting in forming the trough-like portion 14: The edge holes 7 are formed by prongs 28 carried by the upper roll and coacting with recesses 28' in the lower roll. These prongs carry the metal down as at 29.

Lateral guide rolls such as 30 may be provided for the edges of the stock between adjacent pairs of rolls at such points as may be found desirable. Lubricant may be admit.

ted to the guides, cutters or formers at such a stock. These guides may have rails corresponding with the position of the annular projections 26, 26 to guide the ribs of the stock between subsequent pairs of rolls.

The rolls 3%, 3a are provided with pro jections such as 36 corresponding with a ofper. The lower roll also has inclined shoul ers inner. rows of openings for tucking portions 37 of the edges of the zinc ribbon 38 through the openings as shown in Fi 12, the roll 34 being provided with suita 1e recesses to allow for the same. The zinc ribbon may be introduced through a guide 38. The rolls 39, 39 serve to bend or fold under the ed es of the zinc ribbon as shown at 37. is folding is affected by rojections 40 on roll 39 cooperating with oulders and recesses in the roll 39. I

The zinc ma be preliminarily flanged somewhat by suitable rolls or by drawing it through a suitably shaped guide as indicated in Fig. 11* so that it will conform better to the stock where the tucking is to be efiected.

Rolls 42, 42 serve to start the formation of the bead proper, being provided with a. groove 43 and a 'rojection 43' respectively which interfit and bend the strip along the lines 15, 15. The roll 42' also carries projections 44 for entering the edge holes-.7 and spreadin the prongs 29 against the under side of t e stock as shown at 29" Fig. 14, theupper roll 42 having recesses 44' to corres 0nd therewith. I

olls 46, 46' have a central groove and projection 47 and 47 respectively, for continuing the formation of the-bead pr 48, 48 for bending the flanges 13 and 13' res ectively to the position shown at 4, 4

v in ig. 15. The lower roll is provided with .inclined shoulders 48" for bending the 7 These rolls 46, 46 not only gradually form the bead proper, butgdraw the sides inwardly somewhat as shown by the comparison between Figs. 14 and 15,

Ro1ls=51, 51 areshaped in'cross section to continue the formation of the beadproper and drawing in the sides ,as shown in Fi 16. Rolls 46, 46' or the rolls 51, .51 or bot sets of rolls may be adjusted so as to assist in completely flattening the prongs 29'.

The'roll 53 base fin 54 which projects into the inside of the bead and supports it against the'pressure of the u per roll'53'. The rolls 55, 55 press inward the sides of the bead immediately below its edge as shown in Fi 17, the lower edges of the sides of the Ea d being left somewhat free to move. The roll 57 serves tosu port the sides of the head while the latera rolls 58, 58 continue to bend the sides inward so as to substantially close them. 'Ihe'upper roll 57 holds the upper edge of the head in position and assists in giving it its proper shape.

The lower roll 60 continues the support of the sides of the'bead while the rolls 61. 61 complete the formation of the sides and .til the central bead is started. the central bead channel serves to driven or only such rolls as it is necessary a to drive in order to keep the stock moving through the machine .and deliver it finally. All or part of the rolls may be provided with means for adjustment or sprln pressure devices as is common in the meta working art. v

. t will be noted that the shape of the cooperating guide 60 and roll 61 is such as to cause-the edges of the product to flare outwardly at substantially 90 to each other. By varying the proportions and arrangement of the guide 60 and the rolls 61, a bead otherwise the same, maybe given different heights to correspond with different grounds orthicknesses of plaster. The desired result may be obtained by simply substituting the proper rolls and guide. The same rolls may be used even if the stock varies somewhat in thickness.

- By retaining-the ribs in what may be termed their open position throughout the first part of the machine the stock may be readily and accurately guided and held un- After this ide the stock until it reaches the finishing rolls which deliver it from "the machine. It is therefore possible to handle somewhat narrower or wider stock in the same machine byflsuitably adjusting the "introductory as v In the modified-.form of product shown in Fig. 4, the openings '65 in the. side are not'staggered but are arranged side by side.

The openings on the two sides however are staggered'relativc to each other. In this fig ure the Han es 66' are shown substantially at right ang es to the plane'of the side and o the flanges 67 are shown closed toward each-"i other sons to provide undercut key-Way s;

for the plaster at the sidesof the. flan es.

In the form of product shown'in thefianges 70 are turned outwardly instead lateralribs.

In the form shown in Fig. 6, the arrangement of openings is the same as in Figs. 4

of inwardly and there are no continuous and 5 but the flanges 72 are turned inwardly.

and the sides are ribbed as at 73.

In the form shown in F' 7, there are only two. rows of openings 5, 75. with a single rib 76 extending between the rows of openings longitudinally of the bead. In this case the flanges 77 are turned inward and the flanges 78 are turned outward. This figure also shows a plain folded type of nose 79 in place of the bull nose type of the other figures.

In the form of product shown in Fig. 8 there are four rows of openings in each side with ribs 81 and 81'. The flanges 82, 82' are turned inwardly and the flanges 83, 83' are turned outwardly.

Each of the difi'erent forms of product shown has its own advantages. The side toward which the flanges are turned is sometimes more or less rough. For that reason it is desirable to turn the flanges inward where the roughness will not make it unpleasant or diflicult to. handle the product. By varying the size and arrangement of the openings different effects may be produced rendering the product advantageous under different conditions. The openings in the sides may be formed before, at the same time" as, or after the ribs.

. Not only. is the product itself desirable from the standpoint of strength, and its capacity for keying the cement or plaster, but the type of opening, the flanges and the ribs make it possible to produce it at high speed in a single operation which does not require the attendance ofskilled labor or much expenditure for up-keep or loss of time in repairs.

What ll claim is 1.. The process of forming corner head, which consists in slitting a sheet metal stri at opposite sides of the median line thereo openingthe said slits and turning the metal at some of the edges of the openings at an angle to the general plane of the strip to thereby reinforce the strip and then folding the slitted and reinforced strip substantially alon the median line into a nose or. head portion leaving the sides diverging therefrom substantially as described.

2. A continuous process forthe'manufacture of corner bead,'which"comprises first slitting a sheet metal strip at opposite sides of the median line thereof, then opening the slits so formed and turning the metal at some of the edges of the openings at an an le to the general plane of the strip, then rib ing the strip longitudinally between the.

openings therein and finally folding the strip substantially along the median line thereof into a nose or head portion and sides diverging therefrom. l

3. The process of forming corner bead which consists in forming openings in a sheet metal strip along opposite sides of the median line thereof, applying a narrow covering ribbon to the central portion of the corner bead strip, forcing the edges of the narrow covering ribbon down into the openings and bending such edges in under the corner bead strip and then folding the corner bead strip and attached covering ribbon substantially along the median line into a covered nose or head portion with sidesv diverging therefrom.

- a. The process of forming corner head,

greases and then'folding the stock along its central 1 portion and drawing the strip smooth and tight around the folded edge.

\ 6. The process of making corner beads, which comprises perforating metallic stock, forcing portions of a non-corrosive strip into said recesses and then folding the stock and stretchin the strip ac oss the folded edge.

7. The process of making corner beads, which comprises securing the edges of a thin non-corrosive strip, in locking engagement with a heavier stock and then folding said stock andstrip so as to provide the stock with a protected edge.

8. The process of making corner beads, which comprises first applylng'a protective coating to the metallic stock, then applying a relatively narrow strip of non-corrosive metal to that part of the stock which is to form the body of the bead and then bending the stock to form the body and the attaching arms.

9. The process of forming corner beads which comprises securing a protecting strip to the center of a relatively heavier body strip, folding the two strips and stretching the protecting strip across the edge of the heavier body strip and then indenting the sides of the body strip.

10. lln .a corner bead machine, means for :litting the edge portions of a sheet metal strip, means for opening the said slits and turning the metal at the edges thereof at an angle to the plane of the strip and means for folding the strip into a nose with the edge q portions aforesaid diverging therefrom.

11. In a corner bead machine, the combination of rolls for slitting a sheet metal strip, hole opening rolls engaging in the slits so formed and means for progressively bending the strip with the opened slits into a nose and side portions diverging there from.

12. In a corner bead machine, the cornbi nation of rolls for feeding asheet metal strip, means for slitting the sheet advanced by the feed rolls, means for opening the slits so formed and means for progressively bending the strip into a nose with side portions diverging therefrom.

13. In a machine for continuously forniion llll

menses ing corner bead, rolls for continuously feeding a sheet metal strip, slittin rolls arranged to operate on the strip a vanced by the feeding rolls, hole opening rolls engaging in the slits so formed and means for progressively bending the strip into a nose and sides diverging therefrom.

14. In a machine for continuously forming corner bead, rolls for continuously feeding a sheet metal strip, slitting rolls arranged to operate on the strip advanced by the feeding rolls, hole opening rolls engaging in the slits so formed and rolls for progressively shaping the strip passing therebetween into a nose and sides diverging therefrom.

15. In a corner bead machine, means for slitting a sheet metal strip, combined slit opening and rib forming means arranged to operate on the slitted stri and means for folding the ribbed and slitted strip into a nose and sides diverging therefrom.

16. In a corner bead machine, slitting rolls arranged to slit a sheet metal strip, combined slit opening and rib forming rolls arranged to operateon the slitted strip and means for bending the strip into a nose and sides diverging therefrom.

17. In a corner bead machine, the combination with means for forming o enings in a strip of sheet metal and bea forming means for folding the strip into a bead and divergent sides, of means located between said opening forming means and said bead forming means for ap lying a protective ribbon to the bead portion of the strip.-

18. In a machine for making corner bead from a sheet metal strip, the combination with opening forming means and bead forming means, of means interposed between the opening forming means and the bead forming means for interlocking portions of a protective ribbon in the openings formed in the strip.

l9. Ina machine for making corner bead from a sheet metal strip, the combination with opening forming means and bead forming means, of tucking rolls interposed between the opening forming means and the bead forming means for tucking edge portions of a protective ribbon into the openings formed in the strip.

.20. In a-machine for making corner head from a sheet metal strip, the combination with opening forming means and bead forming means, of tucking rolls interposed between the opening forming means and the bead forming means for tucking edge portions of a protective ribbon into the openings formed in the strip and folding means arranged to bend the tucked portions of the ribbon into engagement beneath the strip. a

21. The process for making corner bead from a sheet metal strip which consists in guiding and rolling edges of the metai strip to smooth the same, forming openings in the strip on opposite sides of the centerline,

bending the strip adjacent the center line to form a nose portion and flaring the sides and rear edges outward].

NORRIS EL (IRE CLARK. Witnesses:

I). G. CLARK, A. A. MLACLJEOD. 

